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International audienceThis paper deals with parameter selection and estimation of large and complex simulation models. This estimation problem is addressed in the case of passive observation, i.e. when no controlled experiment is possible. Given the lack of information in the data, an appropriate methodology is proposed to select and estimate some physical parameters of the model. Its implementation is based on a new software: Diffedge which makes it possible to symbolically determine model output sensitivity functions of block diagrams. An application to a winding prototype is developed to illustrate the effectiveness of such an approach in practice

CNES Launchers Directorate (DLA) has to maintain a high level of expertise to achieve its missions regarding the exploitation of the Ariane 5 family launchers and to prepare the future of launchers. For this purpose, developing and using numerical simulation tools is of key importance. CARMEN software is CNES reference tool for simulating propulsion systems from their design to their exploitation. CARMEN regroups several CNES software packages. Among them are: CARDIM, for engine thermodynamics and geometric design, and CARSTAT/CARINS, for analyzing functional behavior of propulsion systems in stationary (CAR-STAT) or transient (CARINS) modes. This paper extensively presents CARMEN software development status and capabilities.

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